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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac989b0f44fe2035f6e13f53eb5d79ff86b4dc1ad32c0ab7a4a1eef1f872dbd2' 
  AND token = 'q2wrgZaGDESFOj2EGtQDEcASIMZy+FDlmABuYO2ZlMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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