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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e976ae6637d70fe99efe244506573e269f5ba947543490639dfa31524c6babd6' 
  AND token = 'DypR3kfuectx1bAwN8xbCPSB6OLlvoXNyf2S1G62gdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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