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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36e786d01efd65638bd7b210b45257a148a3b2b0470296ef68c753bf0cd864b' 
  AND token = 'VpO6nrMgBZqz3gMIWJ+2l6qxthONRrCsAB+kGxeot8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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