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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd03e7568d7675dcab0da3b64fa66ef705282a6c0304f0a943fad2c49d8ae27f4' 
  AND token = 'aXdO55p/rzdGEERWN1ldWtoe6kq9AIA3HmC5yH7ZTE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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