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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '468a4307e826594b6a9f0876cdf47aa16e94ccb5ba54346c460118d9c1cf97a6' 
  AND token = 'hoG5fF6X7H08nZWWkjGF421XDxyGHV32WAuGLrIMKSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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