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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3ccb63862d4c15718d6aaa0330799c99cfcdbc0c588e87c29c95192331bd59d' 
  AND token = 'SUReHifKJCJlqGMAUd8wWYHg01su6tnJ7f5O+sbEvhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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