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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd39fea9eab83868ce8501f72b40c6f05f92a31964273da7dcaaa7a03dace83a9' 
  AND token = 'teSpMC18SsSWc4pT0lPIzpGSxuJxMyE30lOrtVP141A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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