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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '594fa3217b4334611bd690d150695f1f401d02d842abeaffccc2ac6667297a92' 
  AND token = 't8JTPTj6WBjMs7I0Q2gDu+CnfS3QEy7ntwxEy3sHlSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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