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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca9b1df36cba7efff8dcbe639292add00d361e8c384832f001b408e2119a271' 
  AND token = 'fyRK2sJQgZ6fA2EzBuvvdBMbi4H/pXTK2OiuhyK553k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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