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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f79e4dd5a722b8594d0346e507820f702a5b1c89c71b4c3d219043bee580b4a' 
  AND token = 'm1wnDShC7NCx4y+XNIwCzei+dUEt3aqESLYfblEUonc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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