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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c835b2bae55e3c158b4eb933dc5073399b2d0917aff721c4a333d2c0fc971c0d' 
  AND token = 'QmAjPr21r2OwCzoQ/wc+htGRjwOfE+RJHhQRARLKJcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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