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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dba58f393db5e954ab0a92ef340e21a3b961b097f3f86760c5588aa3b0074a05' 
  AND token = 'ZhkEMlNsCzG0EpoZpCJuZ592XvFaYeK7GEf4UOnaVcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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