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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c296a9046f1d41e0647808f1e79bcfb28c0f2a7d6569e84aceb1767608a0084' 
  AND token = '9A2rzevBh5DEjjVZdMu7iqAkFxjddGG6WF72UcwVIgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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