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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c365365e2079ca912652a3c99ce778647874f36aac5c64a7e9cbb2c58ec18d4' 
  AND token = 'I4ugqdU5SI5+kNLrTPoiY+JWgX634ayibFrLf3Xtskg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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