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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd00d2e12024e70f5d6ebbb73721c134c4735b8d41509afbe7b8633f5cea11c86' 
  AND token = 'k58jAHM8QIvYRoGdEsiq/J3DOiav7FiQMxBulNVb0Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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