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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '730daf3ca7851f069f4c24f4dbd6ee4786ad4dc857710caddf85d679abd0881c' 
  AND token = 'LWgsjOuvbJ4aG+p8TUhi8/cNdgF3p9+Q3oUvj5m+Zrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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