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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fedd292a570691855963b3cda39426ddb3c90a7c5b03fbecfc6cb36e4b7f382e' 
  AND token = 'MakuQF1YWAQAb/FR8CHydZ4H2y/DB+IrdL/Yv+UXmVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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