SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9b58e6b50b68f307ebaacae0fa421e1cd45598b0c199e8e1725f1531205810f' 
  AND token = 'cBhPEarpKAOjewNBOwDG6CVCVT/aJZQrqUVbdYpkjoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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