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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'febe7403a5a410e51a2ba875a16db6c513c6b5af8757671dd1dc58d324ff9170' 
  AND token = 'E3VGeya8naCLz5/xoCtxcZgh/N7OgAYsm4D3An717mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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