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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40b05a6fd91980baa4a2097b56c730bc9d2bc728fab7946b45ce99cb59d96b3' 
  AND token = '/NHxVl9PUDzdCcK6wampWT7X/kF92UID4V3U1uqLBgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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