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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd11e5d6af216fb1406ee9f2a85e5ef119cec1fd1695b3da156c4301ae45811eb' 
  AND token = 'bTS1lbwNxABrIQ6BTX2QJqXa5DqhFf2iMi39Qqdfx+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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