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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa57c842276fac8985162a11669dade7d2a7c5afd9d1483c9e062f57c37516e' 
  AND token = 'SDKuUWbYaZ0bu5R0JDj2HdKVeAa4ZphpY6BmN6a96DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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