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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '119597223e8a23f71e98524def3631f680cd262cb8b7e13a9d880d52aa3716bf' 
  AND token = 'OdnHTrvELy5mjctuYPkXdP+hoO7p+o4W04pyDUBzETY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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