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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db67d7346cdc9512154584d1bd7aa5faa49ebe022ea991fda3f15bcd81785086' 
  AND token = '2aCXSER+we6Gdfr3gamPTRv79rX0n+q3luIuCFIMosU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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