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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77de1ada8d98910e54eb6c25ebb0d6d9ea59876eb1e85a6bbd46f96b9774d8e9' 
  AND token = 'AWae0tWqHA28adx+PuBQ6efNbGayvlmhHIgYhVaqruk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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