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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d47255a0c698bd9aa08c61f0766b83233ac58aac9ad64d305923f365ba92a5c' 
  AND token = 'Dx8B7daF9WsXgaPdBFrZDbpLy0I+14HN7DlqrCkYz9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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