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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a9d46aa5477a62bc51eabb5e20c454892429eb867fd75a79d75ffb4672661f' 
  AND token = '9XpX5a2DMLxkv7mi9mBT2RwZ6fxi3i8rDoAoig0grA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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