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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f97580b1ecd94fad50ebdfcdd0378ef92c63a60f42876107adc445fb5de6a72' 
  AND token = 'MciEYc3jRqzAjd5ik5sg5jnO9Qa8lDcg4A8uMPSxyRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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