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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c897be46730bc2bf76259ff462f743008a3da1f456db4eb45c9989b979c0eb' 
  AND token = 'Yq3hNlj2F6OwHquAgkkgsxHet7M+a+FrACTQd6ovFXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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