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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6d5ed81b37d7f7d8920cbfb22a1ddb5c24f22a35e7d83535f84fa5804cd4e8b' 
  AND token = 'Ya6pVKEJ8NhbAe9qpT04FfOvC12caOPCLZrfQKr3/3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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