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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '921fb38cfc543534fca37bd92e3c67af9edd978783433cc91582c7fb556de207' 
  AND token = 'c38Y7g8VUtSW3wAAUnkcuurjCSXTmw6PYLghz6mdbyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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