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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2348ad2d739dee57b6c6e9913e3648b0b46fc699431a2e03ba4a60cbae987c' 
  AND token = 'z/b6hs0VFLWavdz1IpP/kKQcQ7KZfK9TMHcHX77Qq+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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