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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2769cd73b6088dd7b213f3fc10e6133dd12a185c2d83e9aabdd3f5a75cbf3603' 
  AND token = '6vqFg6CdurTVbPIWWBPDuXL7fMV3SuniVs4yKDJDbao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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