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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a20fe2aa66c527ef7cd99a265c232930db675732413af4f6fb06bded6d546d04' 
  AND token = 'yZQwjGgTQu9x44tZw24hWirXDGnfrOX8sTb2jO3KF7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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