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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2d29b58fb131b60c11a7175235fef0bc2bc15d3fd9e6ed61c8797ed6075e3e5' 
  AND token = 'F9l0YsLryXyJ37hGsTa+y3bJUJmLXHdXfhNTTgv+2Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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