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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ee24a0340d96b7855a44fd3a06f67c054a6dcc9aec1d68bafb6f96aa96e2b5' 
  AND token = 'j7x+Aljzze8nwh/5yQARaun7Cfs1a9dkHQLu/wMueIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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