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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af012d5e99789259f89a7acd902b850093d2ec1ee7c80ddb8b708cde3bd168e5' 
  AND token = 'YXVnO6yQu8fwHQY4Wc9Mx3MIj8L8NWO3KVeNSFVWEoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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