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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b65f731f2923568978aeeed53bf1a58a5f039ac106ae018ba867cda0e3a119' 
  AND token = '3Cbz8GR72tazWqlSm4gYq6NnlTNG0mBiUtyxtDgfG7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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