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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8be2122192fa686219d9218e1ab0c9e9ddfce488d77b471fb2e03aa27c45a150' 
  AND token = '9FzctI/E3TBKxZPDE9Tj4E+utUHVGriirT/3uSg0P7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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