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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ab43844e2846f36af41bcc82079e8c7992f1d50a3636671d8ca13b3f726a796' 
  AND token = 'MmqEyuJLEY51VTUyRmZsw0p0Ulv80DIy3wKb0M09bKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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