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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db631d6f063fee7e3a80f52db1bf3c840bab67ea63b87905bee23e9cee3840f2' 
  AND token = 'y8pPwnLc6L+6e7TckbaA9KbG/GMTNGB+ZKXhaSz2uvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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