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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcebcba841d543d804f5e05807317c538dc7eab5bb82802928b7bb68a4b44086' 
  AND token = 'V83rZ6Dh6ucOAUrN/sEG2NpR4cmvpIGvR3l/XDyBiiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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