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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc5a6862ef14efa939f031cccc21bfa98bad86d2b7d6013702c7f7d07be68eba' 
  AND token = 'WP4EV0VeqALPrGGyw6v3fVZ/BaF+n87rTABpbjy18wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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