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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4501ee8cf21e1ef258d30e18c2755514728d6e9629bb96e381c00fb7a4b9fc21' 
  AND token = 'fTO7IbkP/etQuNDBqzDJgQKuuIO4NT83UMYHMcD48JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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