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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1af5d560ac45065591b69486f4d57bc9dde11642caa303f60819b7e9883d4b9b' 
  AND token = 'AtW3y8Mt9YXMfbyeSoaNkrOH9WxXqIvc9VUJNRRGims=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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