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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14f135882c9b170ba746567a22dad7a4bcba5844f35e027473a41142fa36961e' 
  AND token = 'hfCIHh/oG5JrCESJk51e4HtJqv5IqxhoCZUuNP76Uqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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