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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adbdd3d1196cb5ab89afe10e839a8e0b882003c48cccea2231b594be744a79db' 
  AND token = 'yw1iqKODwOHEGwh4Ek+EkWAPtGYOeMA0dqMuYVtE38U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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