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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c070a8d5447c449a4c61a7e91626d68878f7a9fc565a79f4880f4de7ec81fba1' 
  AND token = 'OGyIVEM7h8AiPzWsI5oya7BnfhPHA8DzmZwIF8BRMyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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