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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5284023824b018a5e88c026933db8e58d6d46d08a1e9831fbfbddd2f981dae5d' 
  AND token = '8c3m3h5ebzqcmAKrixaIcqVZXLQgskUOTb1yj3qf7Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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