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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00bb6546e61cb961277425f0e7c5161c57c94f8dbb6dafbb1b199d52da23e6aa' 
  AND token = 'Lhxz5WYq2KIzDu1C5SsRT7znbm//wYbX5zPNNuBN88c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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