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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79bbc3c15df1cc3cd0e0389267d57616d144447cebbd343b5f219cbac0b24b9c' 
  AND token = 'wH1VL19Pf01IEB+Wz7zF5R0fPEXsLwQlvxBqdZIJiW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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