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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d0090a39fcc37b61edd56068137048be3a4097eb0a23f2f9d2daf57093db62c' 
  AND token = 'brRuTnsZsKr9BG3KJ3FG2guoMypQ9VpSB7MNuTC/qNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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