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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab0376e932b9f5276fa85824934aed056d680a201d9dd41d13c4d4d56e062b4b' 
  AND token = 'MOIPLXtEVIv2W9tbqOrbRWIKg1LvcZhTxMfy6081MPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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