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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe629dbeb4b1ef8557aa34afe5450e4aef46d610325224b6cc043230e3064849' 
  AND token = '8BPM4siz3d2QHvQ6QLUN3Yfbao4HSQfEOvWR0EwKfWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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