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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f96be2dc29901a57ef3b9d81883d11bf6971eb1e0fe78a954e58f2f5ec9f828a' 
  AND token = 'KjOa9tu7qNN1rynEMrvHUyTy6rUUmwEy27v9jvnaKcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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