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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfd5cc4a47499dc3e93d54f1d68530bca875af654f0b723681b2fea20053cbe1' 
  AND token = 'mMeIarGnasrd53t0WLwquH8O5dc52eyp43Qo1EG6SPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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