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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97d08a26e8e907a14c855eb156cd91ca81bfa91c9a350acb886f4f89f30b5a13' 
  AND token = 'awvgw81x7AIMj+fe6Jh+ftujwisGLTaJh/qG4Uq34c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}