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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d3e7858e0126277119d5c91e9870f5e9eff0ee045b61581eaf8365ef427b8f6' 
  AND token = 'gPGziokbptAWC9baYdiaOUQ4zcjIW0bBLQv/9v7wX9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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