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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dcbe5d3bba51b8faa320b19fbbd809205007ee60875c531ac68e7d9f5bc603d' 
  AND token = 'ei1SIgog4LeAHGl8S+sp9QNxBceFjkhMUa2NyJ7lBY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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