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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e2b658d2266aed6daa6cacde57747ef37cb086ad5a5d9a0d67afc4f2627c3f' 
  AND token = 'kFE4OgFJfsnRd0e1zFXqw/BJl2HiH8G69npotpPYivs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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