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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28432ff8b886953dafc2bbb04d0f6f1214fe479ceebebe94aedbd3cbd03b7e13' 
  AND token = 'L27yIdYgQVusxLJk2lWRiJRmnScRM241eyKJp2+T+ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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