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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8acc2f3b33c9ad084e6959359dd7526dd6e149b331127878685e9fc0c2123b95' 
  AND token = 'Kj8ytlAPsPea6Kb6UPj/LSfcQj0GD5c2R8Gsm5v8TjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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