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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a38af7a11348f76a97966a4175bc8412e6191b0741fa08f734fc287b217b4ab0' 
  AND token = 'gAkXSjO0W/ChWGvAawGtCh1naQbZyAMOd5D8tWR6C8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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