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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f610c1d9263f79f394651348f1fedd29a337ccc530108e4f8bcc0296f34b6c3' 
  AND token = 'g3V4Sj7ursBvLeQ1WIb5W6BU07Ds6bUVzTxKeA5NB8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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