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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1f3ffced212c9fea2cb9648b0fde248f486147cd4e10cb530b56626e7f0a0bb' 
  AND token = '9v2HSabpPZcFybEkH2e5+92xuRmzCbZaz/V7SWFg4PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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